This past Monday I had unsafe sex with someone and they told me they were HIV negative and on prep. I gave anal and I didn't receive it. It was my first time trying to give anal sex to someone else and after I was done. I started to feel sick to my stomach. I showered right when I got home and a couple of days later I started to itch so I began scratching a lot. I have red marks on my shoulder that I believe are from scratching. I'm also itchy in my groin, arms, neck, beard, ears, eyelids, and face. I might be exaggerating but all I know is that I'm very itchy. I don't know if I was exposed to HIV or another disease. I really hope it's not HIV. A lot of articles say it's the first signs. It was my fault for not wearing a condom. Please help.